As the core database of this site, of course I want to introduce how to install it. I use the simplest Docker installation method here. Of course, if you are more hardcore, you can also try to use the source code to build it yourself. This pit next time Fill it in again😄.

# Install Docker

curl -fsSL https://get.docker.com -o get-docker.sh && sudo sh get-docker.sh

# Build configuration file

Why do I use docker? The main reason is that it can be quickly migrated and upgraded according to actual needs (of course, it is also the simplest. Please create the folders required by ElasticSearch according to the following command, and finally configure the file.

cd /
mkdir -p mnt/elasticsearch
cd mnt/elasticsearch
mkdir config
mkdir master
mkdir slave
chmod 777 master
chmod 777 slave
cd config
touch master.yml
touch slave.yml
nano master.yml

Enter the following content into the newly opened editor (of course, you can also use any other editor you are good at to open master.yml and edit):

cluster.name: elasticsearch-cluster
node.name: master
network.bind_host: 0.0.0.0
network.publish_host: 127.0.0.1
http.port: 9200
transport.tcp.port: 9300
http.cors.enabled: true
http.cors.allow-origin: *
node.master: true
node.data: true
discovery.zen.ping.unicast.hosts: [127.0.0.1:9300,127.0.0.1:9301]

# Adjust system parameters

Here we need to adjust another parameter, otherwise ES cannot be started, first open sysctl:

nano /etc/sysctl.conf

Add the following line of code and save the file:

vm.max_map_count=262144

Execute this command after saving to make the modification take effect.

sysctl -p

# Install

Here you can run it with one sentence command:

docker run -e ES_JAVA_OPTS=-Xms256m -Xmx256m -d -p 127.0.0.1:9200:9200 -p 127.0.0.1:9300:9300 -v /mnt/elasticsearch/config/master.yml:/usr/share/elasticsearch/ config/elasticsearch.yml -v /mnt/elasticsearch/master:/usr/share/elasticsearch/data --name es-master elasticsearch:6.7.0

Among them: -Xms256m -Xmx256m means memory usage, which varies from person to person, and can be adjusted according to the actual memory size.

# test

root@SL:~# curl 127.0.0.1:9200
{
   name: master,
   cluster_name : elasticsearch-cluster,
   cluster_uuid : FWFWyIzgQ9ujGB7uib2e7w,
   version: {
number : 6.7.0,
build_flavor : default,
build_type : docker,
build_hash: 8453f77,
build_date : 2019-03-21T15:32:29.844721Z,
build_snapshot : false,
lucene_version : 7.7.0,
minimum_wire_compatibility_version : 5.6.0,
minimum_index_compatibility_version : 5.0.0
   },
   tagline : You Know, for Search
}

When the output is as shown above, then your ES database has been built~